高压电器2017，Vol.53Issue(5)：1-6,6.DOI:10.13296/j.1001-1609.hva.2017.05.001
沿绝缘表面空气间隙击穿特性的试验研究
Experimental Study of the Breakdown Characteristic of the Air Gap Along Dielectric Surface
摘要
Abstract
There are mainly two opinions about the mechanism of propagation of local arc along a polluted dielectric surface:electrical breakdown process or intense thermal ionization process ahead of the arc that causes the arc propagating.The key point is to determine whether the electric field can reach the breakdown strength of the air gap ahead of the arc roots.Although the electric break characteristic of the pure air gap had been investigated comprehensively,there was still lack of research on the characteristic of air gap along a dielectric surface.This paper devotes to investigate the difference of the dielectric strength between pure air gap and air gap along a dielectric surface as well as the influence of altitude.The effects of different dielectric surface conditions on the breakdown voltage are also studied including dry-clean,dry-polluted,nature-moistened and wet polluted.The experimental results show that the existence of dielectric surface would reduce the breakdown strength of air gap,and the shorter the gap distance,the greater of the influence.Also,the breakdown strength of the air gap along a dielectric surface would decrease with the increase of altitude,but the influence of altitude is smaller than that on the breakdown strength of pure air gap.Comparing with the measured results of electric strength ahead of arc roots,it is found that the electrical breakdown process ahead of the partial arcs is reasonable to occur and should be taken into consideration when modeling the polluted flashover process.关键词
沿面间隙/空气间隙/高海拔/弧根/电击穿Key words
air gap along dielectric surface/air gap/high altitude/arc root/electrical breakdown引用本文复制引用
李健,周军,黄瑞平,梅红伟,关志成,王黎明..沿绝缘表面空气间隙击穿特性的试验研究[J].高压电器,2017,53(5):1-6,6.基金项目
国家重点基础研究发展计划项目(973计划)(2011CB209406).Project Supported by the National Basic Research Program (973 Program) (2011CB209406). （973计划）
